10 Element Facts

Cool Trivia About the Chemical Elements

The elements are more than symbols on the periodic table. An element is the smallest unit of matter that can't be divided using any chemical means.
The elements are more than symbols on the periodic table. An element is the smallest unit of matter that can't be divided using any chemical means. Joachim Angeltun, Getty Images

A chemical element is a form of matter that can't be broken into smaller pieces by any chemical reaction. Essentially, this means elements are like different building blocks used to construct matter. Here are some cool trivia facts about elements.

10 Element Facts

  1. A sample of a pure element consists of one type of atom, which means each atom contains the same number of protons as every other atom in the specimen. The number of electrons in each atom can vary (different ions), as can the number of neutrons (different isotopes).
  1. At present, every element in the periodic table has been discovered or created in a lab. There are 118 known elements. If another element, with a higher atomic number (more protons) is discovered, another row will need to be added to the periodic table.
  2. Two samples of the exact same element may look completely different and exhibit different chemical and physical properties. This is because the atoms of the element can bond and stack in multiple ways, forming what are called allotropes of an element. Two examples of allotropes of carbon are diamond and graphite.
  3. The heaviest element, in terms of mass per atom, is element 118. However, the heaviest element in terms of density is either osmium (theoretically 22.61 g/cm3) or iridium (theoretically 22.65 g/cm3). Under experimental conditions, osmium is almost always more dense than iridium, but the values are so close and dependent on so many factors, it really makes no difference. Both osmium and iridium are about two times heavier than lead!
  1. The most abundant element in the universe is hydrogen, accounting for about 3/4 of the ordinary matter scientists have observed. The most abundant element in the human body is oxygen, in terms of mass, or hydrogen, in terms of atoms of an element present in the highest quantity.
  2. The most electronegative element is fluorine. This means fluorine is best at attracting an electron to form a chemical bond, so it readily forms compounds and participates in chemical reactions. At the opposite end of the scale is the most electropositive element, which is the one with the lowest electronegativity. This is the element francium, which does not attract bonding electrons. Like fluorine, the element is extremely reactive, too, because compounds most readily form between atoms that have different electronegativity values.
  1. It's difficult to name the most expensive element because any of the elements from francium and higher atomic number (the transuranium elements) decay so quickly they can't be collected to be sold. These elements are unimaginably expensive because they are produced in a nuclear laboratory or reactor. The most expensive natural element you could actually buy would probably be lutetium, which would run you around $10,000 for 100 grams.
  2. The most conductive element is the one best able to transfer heat and electricity. Most metals are excellent conductors. The best is silver, followed by copper and gold.
  3. The most radioactive element is the one that releases the most energy and particles via radioactive decay. It's hard to pick one element for this, since all of the elements higher than atomic number 84 are unstable. The highest measured radioactivity comes from the element polonium. Just one milligram of polonium emits as many alpha particles as 5 grams of radium, another highly radioactive element.
  4. The most metallic element is the one which displays traits of metals to the highest extent. These include ability to be reduced in a chemical reaction, capacity to form chlorides and oxides, and ability to displace hydrogen from dilute acids. Francium is technically the most metallic element, but since there are only a few atoms of it on Earth at any given time, cesium deserves the title.